9.1

CVE-2026-68457: linux

CVSS: 9.1v3.1CriticalReceived
AliasesUBUNTU-CVE-2026-68457DEBIAN-CVE-2026-68457
Published 15-08-2026Last modified 18-08-2026
Open JSON

Vulnerability summary

CVE-2026-68457 is a critical (CVSS 9.1) vulnerability in linux. EPSS estimates a 0.70% chance of exploitation in the next 30 days, higher than 52.4% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.70%
0%100%
Low · +0.22 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 9
USN-8781-1USN-8816-1USN-8816-2USN-8816-3USN-8816-4USN-8888-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 18-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for FSCTL mutations SET_SPARSE, SET_ZERO_DATA and SET_COMPRESSION operate on an open SMB handle but call VFS xattr, fallocate or fileattr helpers with the current ksmbd worker credentials. Those helpers can revalidate inode permissions, ownership and LSM policy independently of the SMB handle access mask. Run each operation with the credentials captured in the target file when the handle was opened. Keep credential handling local to these single-file FSCTLs rather than applying session credentials to the complete IOCTL handler, which also contains handle-less and multi-handle operations.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.70%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

+0.22 pp

From 0.48% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.70%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 6.8.0-147.147 | < 7.0.0-34.34
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1067.70 | < 7.0.0-1013.13
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.180-1 | < 6.12.100-1 | < 7.1.5-1
Linux1 product
  • linux≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < a8c18434e1f0d9f7989170bdb0490c0160baf065 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 1e112c47ec5dd1942e2d4ca6e8e9b712238e20c2 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < fb1cae6302d58414ddf029e3f642711bd30243f7 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < e205f3e7e8c31a47cd11efb6cf663a527177e432 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < cfb2c6f71d61ed807c9d7a7af331d406f1f31877 | ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < c6394bcaf254c5baf9aff43376020be5db6d3316 | 5.15

3 vendors · 159 products

References

19 links
Show all 19 references